ecore_con: use only Eina_Magic infrastructure for set and check in Ecore_Con_Url.
We can not have half our code rely on Ecore magic check and the other half
use Eina_Magic or this will lead to inconsistency with Eina_Magic definition.
Reviewers: zmike, segfaultxavi, bu5hm4n, raster
Reviewed By: raster
Differential Revision: https://phab.enlightenment.org/D10383